OpenAI releases GPT-5.6 family with three variants and claims cybersecurity and coding leadership

OpenAI announced GPT-5.6, a new family of models with three variants: Sol, Terra, and Luna. Sol is positioned as the workhorse model, Terra as an intermediate option, and Luna as the budget-friendly variant.

The company claims Sol is 54% more token efficient than previous versions for AI coding tasks, and describes GPT-5.6 as its strongest cybersecurity model, supporting defensive activities such as threat modeling, code review and patching, and blue teaming.

OpenAI also introduced ChatGPT Work, an enterprise-focused tool designed to assist with daily clerical tasks like drafting documents, spreadsheets, and presentations across desktop, web, and mobile platforms.

OpenAI asserts that Sol outperforms Anthropic's Fable 5 on the Artificial Analysis Coding Agent Index by 2.8 points while using less than half the output tokens, taking less than half the time, and costing about one-third less. Terra performs just above Fable 5, and Luna outperforms Anthropic's Opus 4.8, according to the company.

The new models and ChatGPT Work are available across ChatGPT, Codex, and the OpenAI API, with input/output pricing set at $5/$30 per million tokens for Sol, $2.50/$15 for Terra, and $1/$6 for Luna.